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In Reply to: RE: Magnepan MG3 posted by Swamis Cat on April 20, 2014 at 08:34:55
Having reversed your panels, you will notice that there are no longer any 'bars' in front of the ribbon. Magnepan puts those bars at the front, IMO, simply for protection - but the way I see it, they must be causing diffraction of the ribbon sound. So much better to have a clear slot in front of the ribbon. :-))
And if you ever get round to replacing the stock MDF frames, put the rebate for the ribbon cage at the front of the frame - so that the surface of the ribbon cage flange is flush with the front of the frame.
Magnepan, with the 3.6:
a) increased the size of the mid panel (compared to previous models), and
b) flipped the bass-mid driver so the mylar was in front.
I believe the 2nd action directly followed on from the 1st - they thought to deliver more mid by making the mid part of the shared mylar sheet, wider ... and putting the mylar at the front, further enhanced the improved mid range.
Unfortunately, though, the bass driver shares that same sheet of mylar ... and there is good reason to have the magnets in front, for the bass panel. :-((
Regards,
Andy
Follow Ups:
In a conversation with Wendell in regards to my DWMs, I mentioned to him that I preferred my MG3a's backward. He scoffed at the idea, and if memory serves, mentioned something about comb filtering.
Trusting he knows infinitely more about his speakers than I do, I have repeatedly tried the recommended front firing position (Mylar back and tweeters barred). I always prefer them playing backwards, at least when the tweeters are inboard (less so when tweets are out). If there are cons of playing them backward, the pros seem to outweigh them, at least to these ears in my system in my rooms with my twenty plus year old tweeters.
As a follow up question, Andy, does this mean that the newer twenty series gets the best of both? Mylar forward for mids and push pull plates on both sides for the bass?
By the way, I think the DWMs have plates on both sides of the Mylar too.
AIUI, the MG-20 had magnets on both sides of the bass panel only - though I don't know how they placed the mid panel (mylar front or pole-piece front). As I'm sure you're aware, the reason why magnets both sides is good for the bass panel is that it stops the mylar/wire excurting into a region of lower magnetic strength, when it moves away from the magnets during a large bass transient.
However, with the 20.1, Magnepan moved to magnets on both sides of the whole mylar sheet ... I would suspect for mfrg reasons, rather than SQ, as the excursion of the mid panel mylar is so small, it never moves into a region of lower magnetic field strength. And I would suspect the 20.7 is the same.
Regards,
Andy
The MG-20 had magnets on the back of the Mylar. I am not sure they had the thinner Mylar of the Tympani IVa mids.
Here a customized version, http://media-audiogon-com.s3.amazonaws.com/uploads/image/image/345847/scaled_MG20.jpg
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